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Finding the Fourth Proportional to 486.84, 671.46 and 312.20

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Solution

The fourth proportional to 486.84, 671.46 and 312.20 is: 430.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.84 : 671.46 = 312.20 : x
  2. Step 2: Convert to fraction form
    486.84/671.46 = 312.20/x
  3. Step 3: Cross multiply
    486.84x = 671.46 × 312.20
  4. Step 4: Simplify right side
    486.84x = 209,629.81
  5. Step 5: Solve for x
    x = 209,629.81/486.84
  6. Step 6: Final answer
    x = 430.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.